1 files changed, 39 insertions, 0 deletions
diff --git a/graphql2/relay.go b/graphql2/relay.go
new file mode 100644
index 00000000..b037f28b
--- /dev/null
+++ b/graphql2/relay.go
@@ -0,0 +1,39 @@
+package graphql2
+
+import (
+	"encoding/base64"
+	"strings"
+)
+
+
+type ResolvedGlobalID struct {
+	Type string `json:"type"`
+	ID   string `json:"id"`
+}
+
+// Takes a type name and an ID specific to that type name, and returns a
+// "global ID" that is unique among all types.
+func ToGlobalID(ttype string, id string) string {
+	str := ttype + ":" + id
+	encStr := base64.StdEncoding.EncodeToString([]byte(str))
+	return encStr
+}
+
+// Takes the "global ID" created by toGlobalID, and returns the type name and ID
+// used to create it.
+func FromGlobalID(globalID string) *ResolvedGlobalID {
+	strID := ""
+	b, err := base64.StdEncoding.DecodeString(globalID)
+	if err == nil {
+		strID = string(b)
+	}
+	tokens := strings.Split(strID, ":")
+	if len(tokens) < 2 {
+		return nil
+	}
+	return &ResolvedGlobalID{
+		Type: tokens[0],
+		ID:   tokens[1],
+	}
+}
+